detect

代码说明：

  利用雷达方程，分别分析功率孔径积与检测目标距离的关系，并且画出对两种飞行目标类型的功率孔径积，得出相应的结论。(Radar equation analysis of the relationship between the power aperture product detects the target distance, and draw power aperture product of two flight target type, and draw the appropriate conclusions.)